Simulation And Study Of Interior Flow In The Deep-sea Simulator Test Facility

Launching under the conditions of large depth is one of the basic trends of the subaqueous weapon’s launching system. Deep-sea simulator test facility, as one of the major test facility construction projects of XXX, can provide a variety of weapons with the test environment of deep water. Many necessary related experiments and studies can be made with it during the research and development process of launcher. So, it plays an important role in realizing emission under the conditions of large depth by subaqueous weapon’s launching system. The paper mainly studies the interior flow during the launching process on the basis of the air-turbine pump launcher in deep-sea simulator test facility. What the author did are as follows:1. Interior flow of launching system during torpedo launching process in deep-sea simulator test facility is studied. The model of deep-sea simulator test facility has been simplified. The three-dimension and two-phase model of interior flow as viscous and uncompressible under the non-constant flowing state has been built. The model has been simulated for the whole launching process via the dynamic mesh of FLUENT. From the results, the developing trend along the launching process can be observed and the typical moment figure of pressure, velocity and phase has been provided in the paper. Characteristics of interior flow are analyzed at the same time. The result can provide a frame of reference for the arrangement of pressure sensor and continuous-emission experiment design. It has verified the buffer function of the air in deep-sea simulator test facility at the same time.2. The paper has compared and analyzed the process of torpedo launching in deep-sea simulator test facility and submarine. According to the torpedo launching via submarine, the paper has built the interior flow model of torpedo launching underwater from submarine. The model has been simulated for the whole launching process via the dynamic mesh of FLUENT. The characteristics of interior flow during launching process in submarine and deep-sea simulator test facility are almost the same. The torpedo was viewed as ordinary liquid in the paper. Based on that, the flow loss coefficient of two launching system have been extracted from the results of simulations. The flow loss coefficient of launching system in deep-sea simulator test facility is bigger than that one in submarine, which has explained the phenomenon that torpedo’s initial velocity in deep-sea simulator test facility, is slower than that one in submarine at the same launch conditions. The results were compared with the flow loss coefficients of two launching systems which are out of the state of experiment. The comparison results show that the flow loss coefficients during experiment have the same consistency as the ones out of the state of experiment. This fact proves the feasibility of extracting method, and provides reference to determine the flow loss efficient. Further research work such as seeking the relationship between energy loss and the velocity difference to create a new method to forecasting exacter initial velocity in sea trials can be performed according to the coefficients.